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the environment, but that would be a second step after you have someone in custody. the focus of the investigation changes from trying to identify a suspect or a location to actually looking to see if there's material which connects that particular item, in this case a knapsack, to an individual, with their clothing through fibers, or the environment with various dust particles there, whether it's pollen grains that put them in a particular location, the minerals that are present, or even chemicals from bomb-making. all these little particles stick around. what makes trace evidence so valuable is the fact that you can't see it, you're not aware of it, and there's almost no way to protect against it. >> greta: skip, thank you. >> you're welcome. >> greta: well, the pictures, the bags, the fibers and bombs, they are all giant potential clues. right now investigators are rebuilding the bombs from fragments. some are very small. the circuit board could also provide more information. kevin miles join us. kevin, why is the circuit board of any value in an investigation? >> the circuit board, if it's par
. they stress no connection to the developments in boston. in this heightened environment and detective, patted rosen, it's curious. >> it done straits what we have known all along. they hate us and want to kill us they just keep coming at you. >> neil: even though there is not apparent link apparently this guy and these two brothers. you would argue the other day you think there are these kinds of cells where the two, three, four, five people all over the place. >> absolutely. they are unified. they are unified t the extent they hate us. they are absolutely bent on killing us. >> neil: is it a group, one was a chechen connection. there their common theme is they hate us. by that theory, they are everywhere. >> they appear to be a lot more than we have thought. it's safe to assume that the 19-year-old, who forgot surveillance cameras existed and boxer the chip the size of the arizona on his shoulder didn't orchestrate this in vacuum. there are too many moving parts to it. >> neil: local authorities say they did but there is no evidence that point to wider participation? >> i disagree with the f
something. if you see somebody carrying something odd that doesn't fit in the environment, you should seek out law enforcement and bring it to their attention. >> gretchen: you say to look at the people around you. even to the point of no problem staring at them. why? >> yes. as people, we don't like to look at people. anything more than two seconds, you're scary and being rude. you know what? be rude. pay attention to who is next to you. what are they wearing? how do they look? how are they carrying themselves? look at their behaviors. what are they communicating to you not just verbally, but nonverbally. >> gretchen: know where you will evacuate. oftentimes when people get on airplanes, they'll say i'm five rows from the nearest exit. you're talking about just in general, right? >> yes. whether indoors or outdoors. this specific event, you're barricaded in in an area. you're watching the marathon go on. when you get there, assess. if something happens, i want two ways out. if something happens on this side, i will go out this way. if something happens on this side, i will go out that way
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